After DR1, described in [1]}, we continued to work on the data reduction process, which led to several major improvements. The overall process is similar to DR1, with important changes in the self-calibration algorithm, in the sky-subtraction with the Zurich Atmospheric Purge (ZAP) software ([2]}, Appendix REF ), and the use of a “superflat.” This process was first applied to the UDF-10 and MOSAIC (278 exposures) and then to the MXDF (373 exposures). The resulting depth and color images for the three data sets are shown in Fig. REF  and Fig. REF , respectively.
A detailed description of this improved data reduction process is given in Appendix .
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